Figure 4From: Ammonia-oxidizing archaea and bacteria are structured by geography in biological soil crusts across North American arid landsRelationship of archaeal to bacterial amoA ratio across all geographical locations. Ammonia-oxidizing community is correlated with (A) latitude and (B) mean annual temperature. Dotted line at y = 1 indicates division between archaeal vs. bacterial amoA dominance.Back to article page